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(N0 Mode J. E. BLAOKSHAW 8: G. H. ROGERS. ADDING MAGEINE.

No. 463,027. Patented Nov. 10; 1891.

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UNITED STATES PATENT OFFICE.

JOSEPH E. BLAGKSI-IJUV, OF PITTSBURG, PENNSYLVANIA, AND GEORGE II.

ROGERS, OF BIRMINGHAM, ALABAMA.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 463,027, dated November10, 1891. Application filed October 15, 1890. Serial No. 368,223. (Nomodel.)

To aZZ whom it may concern.-

Be it known that we, JOSEPH E. BLACK- sHAW, of Pittsburg, in the countyof Allegheny and State of Pennsylvania, and GEORGE H. ROGERS, ofBirmingham,in the county of Jeffferson and State of Alabama, haveinvented a new and useful Improvement in Adding-Machines, of which thefollowing is a specification.

The object of our invention is to provide a convenient and accurateadding-machine, in which the hundreds shall be indicated upon a circularscale.

It consists in the peculiar construction and arrangement of parts, whichwe will now proceed to fully describe.

Figure 1 is a face view of the instrument. Fig. 2 is a similar View withthe toothed disk removed. Fig. 3 is a central cross-section, and Fig. 4is a detail in perspective of a modification.

In the drawings, A represents a circular base-plate, having a centralfixed pivotal pin a.

B is a hollow metal inclosing case of circular form, with a wall orflange extending upwardly all around its edge. This case has a thickenedhub portion which surrounds the pivotal pin a, but does not approach itclosely.

C is a graduated metal ring mounted upon radial arms 0, connected at thecenter to the hub 0 The lower end of this hub is screwthreadedexternally and screws into an internal thread of the hub of thecontaining case B. Through the hub O of the graduated ring there extendsthe reduced end of the pivotal pin a. Around the upper end of the hub Cthere turns a toothed disk E, which near its periphery rests upon thelugs I) (see Fig. 3) on radial arms 0, to hold it level. Above this diskand turning upon the pivotal pin a is the adj usting-arm F, by which thedisk is turned.

The ring C is graduated in two series of figures and subdivisions. Theinner series is from O to 100, extending around the circumference. Tosave the crowding of figures, only the progression in tens is marked, as10, 20, 30, &c., and the single figures indicating the digits are placedbetween. The outer series of graduations is in hundreds, as 100, 200,800, &c.

The disk E is graduated and numbered with one hundred equalsubdivissions extending around the entire circumference, and itsperiphery is cut with one hundred teeth corresponding to thegraduations. The adjusting-arm F is jointed at the inner end to a collarF, rotating on the cow tral stem or pivotal pin a, so as to rock in avertical plane, and its outer end is constructed as a tooth adapted toreach to the row of teeth on the edge of the disk E and drop into thenotches formed thereby. This arm is bent up to form a handle and thenoutwardly, and may, if desired, have a spring connection with its collarF to permit its rocking action in entering or withdrawing its teeth fromthe notches of the disk. Such spring connection is shown in Fig. 4. Awasher placed above the collar and a screw 0, entering the central pinto, serve to hold the adj usting-arm in place, but still allow it torock vertically and swing radially. The operation of this pait of thedevice is as follows: The zero-point of the disk is placed opposite the'zero-point of the graduated ring, which latter is indicated by a pointer(Z. N ow, if the figures to be added be 12, 26, and St, the teeth of thearm F is placed in the notch of the disk opposite the twelfth graduationon the inner side of the ring, and the arm is swungaround to thezero-point in the direction of the arrow. The tooth of the armis nextplaced in anotch of the disk opposite the twenty-sixth graduation in theinner side of the ring and the arm swung back to zero again. The toothof the arm is then placed in the notch of the disk opposite thethirty-fourth graduation on the inner side of the ring and the arm againswung back to zero, which thus causes these numbers to be stored up, asit were, in a cumulative way upon the disk, which then shows at thepointer (Z the sum 72, which is the result of the addition of theforegoing numbers.

lYhcn the successive additions amount to more than one hundred andinvolve more than a complete revolution of the disk, the completerevolutions of said disk are indicated upon the outer scale of the ringby means of a movable hand eand intermediate gears, which I will 110wdescribe.

Upon the under side of the radial arms C wheel G, having an arm G, thatreaches out to and carries the hand 6 at the outer periphcry of thering, as seen in Fig. 3. This wheel G is prevented from movingaccidentally to a false position by a frictional contact secured bymeans of a spring or spring-washer f, clamped between the hub O and thehub of the case. In gear with the large wheel G is a small pinion whoseshaft extends through one of the radial arms and bears upon its upperend another pinion h with widely-separated teeth. The teeth of thispinion h are locked by a sliding detent 2', which is guided in a slot ofthe radial arm and is forced up to engagement with the pinion h by aspringj. On the upper side of the sliding detent is a cam k, which oncein the revolution of the disk is acted upon by a cam 7t on the underside of the disk to withdraw the detent from the pinion, and at the samemoment a lug Z on the under side of the disk strikes one of the teeth ofthe pinion h and turns it one notch. This motion is transmitted to thelarge wheel G, arm G, and hand 6, and the latter is shifted on the outerscale of the ring C, so as to mark a hundred for each completerevolution of the disk. To disengage the detent, so that the hand may berestored to the zero-point, an arm on is attached to the detent and isbent up through a slot in the ring at n to permit the detent to be thusmanipulated at will.

In making use of our invention we prefer to have the case B and workingparts pivotally mounted upon the plate A, so that the case may be turnedinstead of the arm F and for the furtherpurpose of allowing the entireadding-machine to be readily turned around to a new position withoutbeing lifted from the desk or table; but it is obvious that theadding-machine is complete and may be used without the plate A andpivotal mounting of the case B.

K is an angular projection of the bottom plate or base of thedevicc,which serves as a pointer to keep the place when stopping in theaddition of a column of figures,and which projection is also perforatedto permit the device to be hung up.

L is a spring-detent to hold the disk E to its adjustment.

Having thus described our invention, what we claim as new is 1. Thecombination, in an adding-machine. of a ring 0, graduated upon its outeredge with subdivisions and numbers representing hundreds and upon theinner edge with units extending around the circumference up to onehundred, a central toothed disk E, having grad nations and teethcorresponding in number and progression to those on the inner edge ofthe ring, means for rotating the disk, an index-hand at the outercircumference of the ring, and gears for connecting the disk to saidindex-hand, substantially as shown and described.

2. The combination,in an adding-machine, of a ring O, graduated asdescribed, the central toothed disk E, having a cam and actuating-lug onits under side, a spring-detent 2', pinions g and h, the gear-wheels G,bearing'arm G, index-hand e, and the friction spring-washer f,substantially as shown and described.

3. The combination, with the toothed disk and central pin, of the loosecollar F and the adj listing-arm F, connected thereto so as to rock,asdescribechand bentup to form a handle and then outwardly to engage theteeth of the disk, substantially as shown and described.

4. The combination, in an adding-ma hine, of the central disk E, thering O, graduated as described and provided with a slot in its face, atrain of gears connecting the disk with an index-hand moving over thering, a detent arranged in said train of gears, and an arm m, connectedto the detent and extending through the slot, substantially as shown anddescribed.

5. The combination of the base-plate A, having pivotal pin a, thecontaining-case B, the ring O, graduated as described and provided withradial arms O and hub C the central toothed disk E, and the swingingadjusting-arm F, substantially as shown and described.

JOSEPH E. BLAOKSHAlV. GEORGE H. ROGERS.

lVitnesses to the signature of Blackshaw:

P. T. KILGOUR, FRANCIS M. BIDDLE.

\Vitnesses to the signature of Rogers:

L. J. HALEY, J r., OLIVER J. MILns.

